variant of lumbo- before a vowel: lumbar.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for lumb
Dr. Lumb said yes, a small community like Meadville could n't never offer nothin' like a addykit scope to a brain like Rufus's.Susan Clegg and Her Neighbors' Affairs|Anne Warner
They need have no fear that they will be disappointed, for Mr. Lumb's zeal is based on knowledge.Authors of Greece|T. W. Lumb